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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c567d7ffe5c2b8fafa0dea5e1a088eed10945bcbef442376e0c4eb4ecbece67' 
  AND token = 'd+9+Wy3jRgAaHFwDnkWqkfOI2Ka93bJ31DJwY6ff028=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}